Multiuser Zero Forcing Relaying with Noisy Channel State Information


Armin Wittneben and Ingmar Hammerström


IEEE Wireless Communications and Networking Conference, WCNC 2005, Mar. 2005.

DOI: 10.1109/WCNC.2005.1424648

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We consider a wireless ad hoc network with single antenna nodes under a two-hop relay traffic pattern. Some of the nodes in the network form source/destination pairs, while the other nodes serve as amplify and forward relays. The relay gains are assigned such, that the interference between different source/destination links is nulled (multiuser zero forcing relaying). This essentially realizes a distributed spatial multiplexing gain with single antenna nodes. We introduce a specific zero forcing gain allocation and give comprehensive performance results, which include the impact of noisy channel state information and time variant channel coefficients. One of our most intriguing results shows, that multiuser zero forcing relaying at 5GHz and pedestrian speed achieves a sixfold increase in the sum rate of the network, even if we take the overhead for the measurement and the dissemination of the channel matrices into account.


PHY/MAC, space-time, MIMO, cooperative relaying, multi-user diversity, sum rate, partial channel state information

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